<template>
  <div>
    <!-- 评论列表 -->
    <div class="cmt-list" :class="{'art-cmt-container-1':isShowComments,'art-cmt-container-2':!isShowComments}">
        <van-list v-model="loading" :finished="finished" finished-text="没有评论了，请发表" @load="onLoad" :immediate-check="false">
             <!-- 评论的 Item 项 -->
            <div class="cmt-item" v-for="obj in commentArr" :key="obj.com_id">
                <!-- 头部区域 -->
                <div class="cmt-header">
                <!-- 头部左侧 -->
                <div class="cmt-header-left">
                    <img :src="obj.aut_photo" alt class="avatar" />
                    <span class="uname">{{obj.aut_name}}</span>
                </div>
                <!-- 头部右侧 -->
                <div class="cmt-header-right">
                    <van-icon
                    name="like"
                    size="16"
                    color="red"
                    v-if="obj.is_liking === true"
                    @click="likeFn(true,obj)"
                    />
                    <van-icon name="like-o" size="16" color="gray" v-else @click="likeFn(false,obj)" />
                </div>
                </div>
                <!-- 主体区域 -->
                <div class="cmt-body">{{obj.content}}</div>
                <!-- 尾部区域 -->
                <div class="cmt-footer">{{timeAgo(obj.pubdate)}}</div>
            </div>
        </van-list>

    </div>

    <!-- 发表评论 -->
    <!-- 底部添加评论区域 - 1 -->
    <div class="add-cmt-box van-hairline--top" v-if="isShowComments === true" @click="toggleCommentsFn()">
      <van-icon name="arrow-left" size="0.48rem" @click="$router.back()" />
      <div class="ipt-cmt-div">发表评论</div>
      <div class="icon-box">
        <van-badge :content="totalComments?totalComments:''" max="99">
          <van-icon name="comment-o" size="0.53333334rem" @click.stop="commentClickFn"/>
        </van-badge>
        <van-icon name="star-o" size="0.53333334rem" />
        <van-icon name="share-o" size="0.53333334rem" />
      </div>
    </div>

    <!-- 底部添加评论区域 - 2 -->
    <div class="cmt-box van-hairline--top" v-else>
      <textarea @blur="blurFn" v-zdybq placeholder="友善评论、理性发言、阳光心灵" v-model.trim="comText"></textarea>
      <van-button type="default" :disabled="comText.length === 0" @click="sendFn">发布</van-button>
    </div>
  </div>
</template>

<script>
import { commentsListAPI, commentsDislikingAPI, commentsLikingAPI, commentsSendAPI } from '@/api'
import { timeAgo } from '@/utils/date'
export default {
  name: 'Detail',
  data () {
    return {
      offset: null, // 偏移量评论ID
      commentArr: [], // 文章评论列表
      isShowComments: true, // 是否展示发表评论区
      totalComments: 0, // 评论总数量
      comText: '', // 评论内容
      loading: false,
      finished: false,
      lastId: null// 分页
    }
  },
  async created () {
    const res = await commentsListAPI({
      id: this.$route.query.art_id // 文章Id
    })
    console.log(res)
    this.commentArr = res.data.data.results
    this.totalComments = res.data.data.total_count
    this.lastId = res.data.data.last_id
    // 网页打开 没有评论 ->res结果为空数组
    if (res.data.data.results.length === 0) {
      this.finished = true
    }
  },
  methods: {
    timeAgo,
    // 评论区点赞
    async likeFn (bool, commentObj) {
      if (bool === true) {
        // 想要取消点赞
        commentObj.is_liking = false
        await commentsDislikingAPI({
          commentId: commentObj.com_id
        })
      } else {
        // 想要点赞
        commentObj.is_liking = true
        await commentsLikingAPI({
          commentId: commentObj.com_id
        })
      }
    },
    // 切换评论区1和评论区2方法
    toggleCommentsFn () {
      this.isShowComments = false
    },
    // 一键滑动到评论区
    async commentClickFn () {
      document.querySelector('.like-box').scrollIntoView({
        behavior: 'smooth'
      })
    },
    // 评论 - 失去焦点
    blurFn () {
      setTimeout(() => {
        this.isShowComments = true
      }, 0)
    },
    // 评论 - 发送评论
    async sendFn () {
      const res = await commentsSendAPI({
        id: this.$route.query.art_id,
        content: this.comText
      })
      console.log(res)
      this.commentArr.unshift(res.data.data.new_obj)
      this.comText = ''
      this.totalComments++
      this.commentClickFn()
    },
    // 评论 - 加载更多
    async onLoad () {
      if (this.commentArr.length > 0) {
        const res = await commentsListAPI({
          id: this.$route.query.art_id, // 文章Id
          offset: this.lastId
        })
        this.commentArr = [...this.commentArr, ...res.data.data.results]
        this.totalComments = res.data.data.total_count
        this.lastId = res.data.data.last_id
        if (res.data.data.last_id === null) this.finished = true// 数据加载完毕了
        this.loading = false
      } else {
        this.loading = false
      }
    }
  }
}
</script>

  <style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}
/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 46px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>
